I am the author of that dc. You are correct about its behavior. See https://git.gavinhoward.com/gavin/bc/src/branch/master/manuals/dc/A.1.md#arithmetic https:

I am the author of that dc. You are correct about its behavior. See https://git.gavinhoward.com/gavin/bc/src/branch/master/manuals/dc/A.1.md#arithmetic https://git.gavinhoward.com/gavin/bc/src/branch/master/manua... (scroll down to the underscore command).